Stop mechanism for expansible pulleys.



Nps14,9a6. PATENTED MAR. 13, 1906. .Y 01.11am).

STOPMBGHANISM FOR EXPANSIBLB PULLEYS.

APPLICATION FILED JUNE 28, 1904.

milwsses' y W P ginvr' OFFICE...

CHARLES-J. REED, or PHILADELPHIA, PENNSYLVANIA, Assienoa TO REED-MORRILL'ELEGTRIO 00., A. CORPORATION OF PENNSYLVANIA.

STOP MECHANISM FOR EXPANSIBLE PULLEYS.

Patented Mlarcn 13,1 906.

T wil whom, it may concern.-

Be it known that I, CHARLES REED, a

- citizen of the United States, residing at Phil-" adelphia, in the county of Philadelphia and State-of Pennsylvania, have inventedcertain new and useful Improvementsv in Stop Mech anism for Expanslble Pulleys, of which the following isa specification.

. In United States Patents Nos. 7 58,47 4 and 758,561, granted tome April 26, 1904, I have shown and claimed a mechanism for trans-' .m1tt1ng power from a dIlVlIlg to a dr ven shaft and enabling the speed of the driven shaft to be varied with reference to that of the driving-shaft, comprising a double pulley placed between and belted to pulleys on the riving and the driven shafts. Each drum of the double pulley consists of a set of radiallynermost position.

Wise fixed onthe pulley-shaft 5, and the adjustable rim-sections the ends of which pass throu h radial'slots in circular guideplates and ave teeth entering spiral grooves in circular adjusting-disks. Differential-gearmechanism is'provided to rotate the guideplates with reference to the adjusting-disks, thereby simultaneously moving either set of. rim-sections inwardly and the other out- Wardly, contracting one drum and expanding the other. The shaft of the double pulley is carried by'rock-arms to compensate for Referrmgto the accompanying drawings, Figure 1 is a vertical axial section of one end of an expansible ulley. Fig. 2 is. an end ele-' vation of the pu ley; and Fig. 3'is a side elevation, partially .in vertical section, of one drum of a double pulley on a reduced scale.

. The pulley whichhas been chosen to illustrate the invention comprises acircular series' of radially-adjustable rim-sections 1, having toothed ends 2, which pass through radial slots 3 in the guide-plates and enterspiral' grooves 4 in the adjusting-disks. The ad-. usting-disksare preferably keyed orotherguide-plates of each pulley-drum are secured Application filed June.28,19()4. Serial No- 214.607-

to the flangedends of a sleeve 6, which is revolubly supported on the pulley-shaft between a pair of the adjusting-disks, as shown in my specified patents. 'In constructing and operating pulleys of thistype it is found that when the rim-sections reach their outermost or innermost position they are liable to be forcibly pressed against the ends of the radial guideslots or against one another by thewedging action of the spiral grooves. They thus bind between the guide-plates and adjusting-disks and render it difiicult to again rotate these with reference to each other. The present inventionis a mechanismto stop the rotation of the guide-plates just before the rim-sec.-

tions reach either end of the guide-slots or at any predeterminedv position. For this purpose a flanged ring 7 1s screwedto the periphery of the end guide-plate 8 and extends over and incloses the outer edge of the end adjust-.

ing-disk 9. This ring is provided with a sinle tooth 10, which'projects radially inward. crewed' to the outer face of the adjustingdisk 9 is a plate carrying a journal 11, on

which is mounted a pinion 12. This pinion has thirteen perfect teeth 13 to 25and two imperfect teeth 2627, between which is a concave blank portion 28.

a bent free end 30 in osition to enter the space between two teet of the pinion, and thereby normally hold it against rotation. The number of perfect teeth on the pinion is one less than the number ofrevolutions the adjusting-plateis to make with reference to the guide-plate. The spiral groove in the adjustlng-plate 9 windsoutward in a clockwise direction.

In Fig. 1 the rim-sections are shown in theirinnermost position, having been brought to this position by rotating the guide-plateS in a clockwisedir'ection, as viewed from the end of the pulley, until the tooth 10 enters the space between the teeth 26 27 of the inion. The blank 28 thereupon prevents furt er rotationof the pinion and guide-plates at the predetermined oint. To shift the rimesections outward, t e guide-plate 8. is rotated-in a contra-clockwise direction as viewed from the end of the pulley and indicated by the arrow in Fig 2. Each rotation ofthe guideplate moves the rim-sections -outward by the distance of one. thread and simultaneously A spring-detent. 29 is secured to the adjusting-d1sk 9 and has rotates the pinion 12 through a predetermined angle. WVhen the guide-plate has made the predetermined number of revolutions, bringing the rim-sections to their outermost position, the tooth 10 on the guide-plate will again come in contact with the blank 28 and prevent further rotation of the pinion and. guide-plate in that direction. In this operation the tooth 1O strikes successively the alternate pinion-teeth 13 to 27 and 14 to 24 and finally the blank 28. The spring-stop 29 prevents any accidental rotation of the pinion until the pulleyadjusting mechanism is put into operation and overcomes the resilience of the spring.

The total number of teeth in the pinion 12 and the number moved at each contact of the tooth 10 may be varied in order to produce a greater or less number of revolutions before the blank 28 engages the tooth 10.

An additional tooth 31 on the flange 7 may be located in any desired part of the circumference to act in conjunction with the tooth 10 to produce a fraction of a complete revolution in addition to any given number of revolutions. If, for example, the angular distance between the teeth 10 and 31 is sixty degrees, rotation of the guide-plate in the direction of the arrow will cause tooth 31 to strike pinion-tooth 13 and tooth 10 to strike pinion-tooth 15 in one revolution. The teeth 31 and 10 will thereafter successively strike the alternate pinion-teeth from 17 to 27 and from 14 to 24 until the tooth 31 finally strikes the blank 28 after seven complete revolutions plus an arc of sixty degrees, or one-sixth of arevolution. Evidently the supplemental tooth 31 maybe so located as to limit the partial revolution to any desired predetermined angle.

I claim 1. An expansible pulley, comprising rimsections, guide-plates and adjustingdisks, said plates and disks relatively revoluble, and a stop mechanism consisting of an incomplete pinion and a tooth engaging said pinion, one member of said stop mechanism carried by an adjusting-disk and the other member carried by a guide-plate, as set forth.

2. An expansible pulley, comprising rimsections, guide-plates and adjusting-disks, said plates and disks relatively revoluble, and a stop mechanism consisting of an incomplete pinion and a tooth engaging said pinion, one member of said stop mechanism carried by an adjusting-disk and the other member carried by a piece which extends from a guide-plate past the edge of said disk, as set forth.

3. An expansible pulley, comprising rimsections, guide-plates and adjusting-disks,

' said plates and disks relatively revoluble, and

a stop mechanism consisting of an incomplete pinion and a tooth engaging said p1n1on, said pinion carried by an adjusting-disk and said tooth carried by a guide-plate, as set forth.

1. An expansible pulley, comprising rimsections, guide-plates and adj usting-disks, said plates and disks relativelyrevoluble, and a stop mechanism consisting of an incomplete pinion and a tooth engaging said pinion, said pinion j ournaled on the outer face of an adj usting-disk and said. tooth carried by a piece which extends from a guide-plate past the edge of said disk, as set forth.

5. An expansible pulley, comprising rimsections having toothed ends, radially-slotted guide-plates and spirally-grooved ad justing-disks receiving the ends of said rim-sections, said plates and disks relatively revoluble, and a stop mechanism consisting of any incomplete pinion and a tooth engaging said pinion, one member of said stop mechanism carried by an adjusting-disk and the other member carried bya guide-plate, as set forth.

6. An expansible pulley, comprising rimsections having toothed ends, radially-slotted guide-plates and spirally-grooved adustingdisks receiving the ends of said rim-sections, said. plates and disks relatively revoluble, and a stop mechanism consisting of an. incomplete pinion and a tooth engaging said pinion, said pinion j ournaled on the outer face of an adjusting-disk and said tooth carried by a piece which extends from a guide-plate past the edge of said disk, as set forth.

7. An expansible pulley, comprising rimsections, guide-plates and ad justing-disks, said plates and disks relatively revoluble, and a stop mechanism consisting of an incomplete pinion and a tooth engaging said. pinion, one member of said stop mechanism carried by an adj Listing-disk and the other member carried by a guideplate, and a spring-actuated detent for said pinion, as set forth.

8. An expansible pulley, comprising rimsections, guide-plates and ad justing-disks, said plates and disks relativelyrevoluble, and a stop mechanism carried by a guide-plate and adjusting-disk and consisting of an incomplete pinion and two spaced. teeth in position to engage said. pinion, as set forth.

9. An expansible pulley, comprising rimsections, guide-plates and. adjusting-disks, said plates and disks relatively revoluble, and astop mechanism consisting of an incomplete pinion j ournaled on the outer face of an adjusting-disk and two spaced teeth in position. to engage said pinion and carried by a guideplate, as set forth.

In testimony whereof I allix my signature in presence of two witnesses.

CHARLES J. REED.

WVitnesses LoUIs DU HADWAY, VVILLIAM H. REMsnN. 

